TW201534442A - Heat dissipation structure of powered hand tool - Google Patents

Abstract

This invention relates to a heat dissipation structure of powered hand tool, which provides a heat dissipation structure of the motor, the circuit board, and the bearings of the electric hand tool, it comprises a casing disposed therein with a circuit board, a motor, a fan, a fixing cylinder, a rear bearing, a coupling fan, a front bearing, a threaded ring, a chuck, a chuck sleeve, and a limiting sleeve, wherein the casing has vents and has passages connected to the motor; the motor is disposed with first air inlets connected with the fan; the fixing cylinder is disposed with first air discharging ports, air vent slot holes; and the chuck is sleeved with outlets. With the aforementioned structure, this invention can achieve the efficacy of dissipating the heat of the circuit board and the motor. Furthermore, the casing is disposed with the outer and inner recess parts; the coupling fan is disposed with air guiding channels; the fixing cylinder is disposed with the second air inlets. The second air discharging ports is connected with the air guiding channels to discharge hot air through the air vent slot holes and the outlets. With the aforementioned structure, this invention can achieve the efficacy of dissipating the heat of rear bearing. Accordingly, this invention can avoid the malfunction and service life reduction of electric hand tool due to overheating.

Description

Electric hand tool heat dissipation structure

The invention relates to a heat dissipation structure of an electric hand tool, in particular to a motor-driven rotating fan and an interlocking fan, so that air flowing in the outer casing can bring out the circuit board, the motor and the bearing heat source.

Cha, the known electric hand tools (such as electric engraving machine), inside are equipped with circuit boards, motors and bearings, and drive motors with high voltage, the speed is usually about 20,000 ~ 40,000 rpm, the board and the motor are relatively hot Especially when the bearing rotates under high speed, it generates friction heat more than the circuit board and the motor. However, such high temperature usually reduces the life of the electronic parts. Moreover, even if the damage is not immediately caused, the heat of the high heat rises and contracts. Changes also affect the change of insulation material, embrittlement, easy to affect the stability of bearing rotation, or excessive heat, so that it is impossible to hold the electric hand tool to affect the operation. In view of this, in order to improve the above-mentioned heat dissipation problem, the inventor of the present invention has carefully studied and developed many years of experience in the development and manufacture of electric hand tools, and finally has the invention.

The main object of the present invention is to solve the above problems, and to provide a heat dissipation structure for an electric hand tool, which has better heat dissipation and practical effects. The main technical and objective of the present invention is to provide a passage between the outer casing and the motor. The motor rotates the fan to drive the air flow, and the airflow enters through the vent and passes through the first air inlet, the first air outlet through the air vent hole, and the outlet leads the hot air, thereby achieving heat dissipation of the circuit board and the motor, thereby avoiding The electronic parts are heated and burnt, which causes the material to become brittle and detract from the life.

Another object of the present invention is that the drive shaft is provided with an interlocking fan rotatably driving the air flow, and the air flow enters the second air inlet through the outer concave portion and the inner concave portion of the outer casing, and passes through the air guiding passage through the second air outlet, the air leakage slot and The outlet discharges the hot air, and by the above configuration, the heat dissipation of the rear bearing is achieved, and the high thermal expansion of the bearing is avoided to cause the use instability.

10‧‧‧ Shell

100‧‧‧ vents

101‧‧‧Outer recess

102‧‧‧ Inside recess

103‧‧‧Bumps

104‧‧‧ screw seat

105‧‧‧The top block

11‧‧‧Motor

110‧‧‧ shaft

111‧‧‧First air inlet

112‧‧‧Connected holes

12‧‧‧ boards

13‧‧‧Power connector

14‧‧‧Fan

15‧‧‧ bushing

20‧‧‧ fixed cylinder

20a‧‧‧Cylinder

20b‧‧‧Contraction

20c‧‧‧ Tapered

200‧‧‧ fitting slot

201, 310‧‧‧ external thread

202, 51‧‧‧ internal thread

203‧‧‧ Ring Channel

21‧‧‧ plane

22‧‧‧First air outlet

23‧‧‧second air inlet

24‧‧‧second air outlet

25‧‧‧ Ventilation slot

26‧‧‧Tram

30‧‧‧ chuck

300‧‧‧ drive shaft

301‧‧‧Connector

31‧‧‧Spiral ring

32‧‧‧ front bearing

33‧‧‧ linkage fan

330‧‧‧air guide

34‧‧‧ rear bearing

40‧‧‧chap cover

41‧‧‧ Groove

42‧‧‧Flange

43‧‧‧Export

44‧‧‧Opening

50‧‧‧ Limit set

52‧‧‧ convex ring

60‧‧‧ channel

Figure 1 is an overall exploded view of the present invention

Figure 2 is a perspective view of the overall combination of the present invention

Figure 3 is a side elevational cross-sectional view of the present invention

Figure 4 is a partial cross-sectional view of the second air inlet of the present invention

Figure 5 is a front cross-sectional view of the A-A of the present invention

Figure 6 is a partial cross-sectional view of the second exhaust port of the present invention

Figure 7 is a front cross-sectional view of the B-B of the present invention

In order to make the present invention more familiar with the present invention, a preferred embodiment will be described in conjunction with the drawings, which will be described in detail later. Referring to Figures 1 to 4, a casing 10 is provided with a circuit board 12 and a motor 11 , the fan 14, the fixed cylinder 20, the rear bearing 34, the interlocking fan 33, the front bearing 32, the screw ring 31, the collet 30, the collet sleeve 40, and the limiting sleeve 50, wherein the circuit board 12 is provided with a power connector 13 at one end thereof. The motor 11 is connected to one end, and the rotating shaft 110 of the motor 11 is provided with a fan 14. The fixed cylinder 20 covers the fan 14 and is assembled on the front end of the motor 11. The front end of the fan 14 is provided with a sleeve 15 provided with a sleeve 30. Drive shaft 300, its end A joint 301 is provided. The drive shaft 300 sequentially passes through the set screw 31, the front bearing 32, the interlocking fan 33, and the rear bearing 34, and the joint 301 is assembled into the sleeve 15 to integrally connect the motor 11 to the chuck 30, and then The screw ring 31 is screwed into the fixed cylinder 20 to fix the front bearing 32. The chuck 30 is sleeved with the clamping sleeve 40 and the front end is exposed. The inner ring surface of the limiting sleeve 50 is provided with a convex ring 52, and the outer surface of the clamping sleeve 40 is provided. a flange 42 , the limiting sleeve 50 is screwed into the fixing cylinder 20 to assemble the collet sleeve 40 and the fixing cylinder 20; further, the outer side of the outer casing 10 is provided with a venting opening 100, and an abutting block 105 is disposed therein. Abutting the two sides of the motor 11 to form a passage 60 between the outer casing 10 and the motor 11, the front end of the outer casing 10 is provided with outer and inner concave portions 101, 102. The outer concave portion 101 has a gap with the inner wall surface of the limiting sleeve 50 and can communicate with the external air flow. A loop channel 203 is formed between the end of the outer and inner recesses 101 and 102 and the limiting sleeve 50. The outer and inner recesses 101 and 102 are connected by the annular passage 203. The first end of the motor 11 is provided with a plurality of first advances. The tuyere 111 has a plurality of communication holes 112 communicating with the first air inlet 111 at its end surface; the fixed cylinder 20 can be divided into a cylindrical portion 20a and a constricted portion 20b. The tapered portion 20c is provided with a plurality of first exhaust openings 22 at the periphery of the constricted surface of the constricted portion 20b. The fan portion 14 and the communication hole 112 communicate with the first air inlet 111 through the constricted portion 20c. The contracting end surface of 20b is provided with a plurality of air outlet slots 25 having a hole at one end and an open channel at one end. The chuck sleeve 40 is provided with an outlet 43 corresponding to the air outlet slot 25 along the flange 42. The air channel hole 25 and the constricted portion 20a communicate with the first air outlet 22; further, the outer periphery of the tapered portion 20c is provided with a plurality of second air inlets 23 that are offset from the air leakage slot 25 and penetrate the inside of the fixed cylinder 20. And communicating with the inner concave portion 102, the open air channel of the air leakage slot 25 is provided with a second air outlet 24 communicating with the inner portion of the fixed cylinder 20; the peripheral edge of the interlocking fan 33 is provided with an air guiding channel 330, and the end surface is open Connected to the second air inlet 23, the peripheral opening corresponding to the second exhaust port 24 is connected to the blowhole hole 25 and the outlet 43; The outer peripheral ring of the collet sleeve 40 is provided with an opening 44 for providing the front bearing 32 to communicate with the external airflow; by the above structure, the heat dissipation of the circuit board, the motor and the bearing is achieved, and the use of the electric hand tool for heating and ironing is avoided, and the use failure and the life loss are practical. efficacy.

The details of the composition of the present invention are as follows: As shown in FIGS. 1 to 4, the electric hand tool of the present invention is exemplified by an electric engraving machine, and the outer casing 10 is a two-and-a-half-half shell provided with a screw seat 104 snail. The upper and lower ends of the constricted portion 20b of the fixed cylinder 20 are provided with a flat surface 21, and the screw base 104 is arranged to abut against the plane 21 to restrict the fixed cylinder 20 from being detached; The fitting groove 200 of the tapered portion 20c of the 20 is provided with the engaging groove 200 of the corresponding projection 103 to engage with each other, and the fixed cylinder 20 is restricted from rotating, so that the outer casing 10 and the fixed cylinder 20 are stably combined; the outer circumference of the cylindrical portion 20a and the outer casing 10 is closely fitted, so the airflow driven by the fan 14 can only be forcibly discharged by the first exhaust vent 22; further, the rear bearing 34 is assembled into the cylindrical portion of the constricted portion 20b of the fixed cylinder 20, and the front bearing 31 is assembled in the fixed cylinder The tapered portion 20c of the 20 is provided with an internal thread 202. The spiral ring 31 is provided with an external thread 310, and the front bearing 32 is screwed and fixed, and the drive shaft 300 can be stably rotated. The fan 33 and the collet 30 are connected; the tapered portion 20c of the fixing cylinder 20 is provided with a pin hole 260 for a latch 26 to be assembled. The end face of the flange 42 of the collet sleeve 40 is provided with a recess 41 for inserting the latch 26 so that the collet sleeve 40 can be correctly assembled to the tapered portion 20c so that the outlet 43 corresponds to the end of the vent hole 25; The inner sleeve 51 of the limiting sleeve 50 is provided with an inner thread 51, and the outer portion 201 of the tapered portion 20c is screwed, so that the clamping sleeve 40 is not disengaged, and the end of the limiting sleeve 50 and the outer casing 10 are retained. The spacing, the formation of the outer recess 101 can communicate with the external air flow.

Referring to FIG. 3, when the motor 11 drives the fan 14 to rotate, the cold air is sucked into the casing of the casing 10 by the vent 100, and after cooling the electronic components through the circuit board 12, the motor 11 is cooled through the passage 60, which is cold. The air absorbs thermal energy and is converted into hot air, and enters the first air inlet 111 of the motor 11, and then enters the inside of the fan 14 via the communication hole 112, and the fan 14 further heats the air. The first exhaust vent 22 is pressed out to the constricted portion 20b of the fixed cylinder 20, and the hot air is taken out through the vent hole 25 and the outlet 43 of the tapered portion 20c, and the fan 14 is continuously rotated to turn the circuit board 12 and the motor 11 The heating temperature continues to bring out the outside, achieving the practical effect of heat dissipation.

Referring to FIGS. 3 to 5, when the drive shaft 300 drives the interlocking fan 33 to rotate, The cold air is sucked into the annular passage 203 by the outer recess 101 and enters the inner recess 102. The cold air is introduced between the rear bearing 34 and the interlocking fan 33 by the second air inlet 23 corresponding to the inner recess 102, so that the rear bearing 34 is cooled by heat. After that, the cold air absorbs the heat energy of the bearing 34 to be converted into hot air. Referring to FIGS. 6 to 7, the hot air is rotated and attracted by the interlocking fan 33 to enter the air duct 330, and then enters through the second air outlet 24. The air outlet slot 25 and the outlet 43 of the tapered portion 20c guide the hot air, and the interlocking fan 33 continuously rotates, so that the heat generation temperature of the rear bearing 34 can be continuously taken out to the outside, thereby achieving the practical effect of heat dissipation; Since the heat is not located in the sealed inner space, the cold air is circulated through the opening 44 of the chuck 40, so that the heat temperature of the front bearing 31 can be taken out to the outside to achieve heat dissipation.

According to the above configuration, the present invention provides an electric hand tool "double intake, double exhaust" The unique heat dissipation structure avoids the heat dissipation of the circuit board and the motor electronic parts, which causes the material to be embrittled, detracts from the life and avoids the high thermal expansion of the bearing, which causes the use of unstable effects.

However, the above is only a preferred embodiment of the present invention and is not intended to be used. Limitations of the present invention, and the re-creation of the technical means and the creation principle of the present invention are still the equivalent structural ideas of the present invention.

In summary, the structure of the present invention does have excellent practicality and enhanced work. Effective, in line with the provisions of the Patent Law, 提出 apply in accordance with the law.

10‧‧‧ Shell

100‧‧‧ vents

101‧‧‧Outer recess

105‧‧‧The top block

11‧‧‧Motor

110‧‧‧ shaft

111‧‧‧First air inlet

112‧‧‧Connected holes

12‧‧‧ boards

13‧‧‧Power connector

14‧‧‧Fan

15‧‧‧ bushing

20‧‧‧ fixed cylinder

203‧‧‧ Ring Channel

21‧‧‧ plane

22‧‧‧First air outlet

23‧‧‧second air inlet

24‧‧‧second air outlet

25‧‧‧ Ventilation slot

30‧‧‧ chuck

300‧‧‧ drive shaft

301‧‧‧Connector

31‧‧‧Spiral ring

32‧‧‧ front bearing

33‧‧‧ linkage fan

330‧‧‧air guide

34‧‧‧ rear bearing

40‧‧‧chap cover

42‧‧‧Flange

43‧‧‧Export

44‧‧‧Opening

50‧‧‧ Limit set

52‧‧‧ convex ring

60‧‧‧ channel

Claims (4)

An electric hand tool heat dissipation structure is provided with a circuit board, a motor, a fan, a fixed cylinder, a rear bearing, a linkage fan, a front bearing, a screw ring, a chuck, a chuck cover, and a limit sleeve, wherein the circuit board is provided One end is provided with a power connector, and one end is connected with a motor. The rotating shaft of the motor is provided with a fan. The fixed cylinder is assembled with a fan and is fixed on the periphery of the front end of the motor. The front end of the fan is provided with a sleeve, and the clamping head is provided with a transmission shaft. The end is provided with a joint, and the transmission shaft sequentially passes through the set screw ring, the front bearing, the interlocking fan and the rear bearing, and the joint is assembled into the sleeve so that the motor integrally interlocks the chuck, and then the screw is screwed to fix the cylinder before being fixed. a bearing, the collet sleeve is combined with the collet sleeve and the front end is exposed, the inner ring surface of the limiting sleeve is provided with a convex ring, and the outer ring surface of the collet sleeve is provided with a flange, and the limiting sleeve is screwed to the fixing cylinder, and the convex ring is convexly convex The edge is provided with the clamping sleeve and the fixed cylinder; the utility model is characterized in that: the outer rear end of the outer casing is provided with a venting opening, and the inner part is provided with an abutting block against the two sides of the motor to form a passage between the outer casing and the motor; At least one first air inlet is provided at a periphery of one end of the motor, The end surface of the reaching end is provided with at least one communication hole communicating with the first air inlet; the fixing cylinder is divided into a cylindrical portion, a constricted portion and a tapered portion, and the cylindrical portion is provided with at least one first at a periphery of the constricted portion of the constricted portion The air outlet is connected to the first air inlet via a fan and a communication hole, and the tapered portion is provided with at least one air leakage slot at the contracted end surface of the contraction portion, and the clamp sleeve is provided with an outlet corresponding to the air outlet slot along the flange ring. The outlet communicates with the first exhaust vent through the vent hole and the constricted portion; the outer ring of the collet sleeve is provided with an opening to provide a front bearing to communicate with the external airflow; and the above structure is used to achieve heat dissipation of the circuit board and the motor, thereby avoiding heating of the electric hand tool, It is a practical effect that causes burns and reduces life. The heat dissipation structure of the electric hand tool according to the first aspect of the invention, wherein the front end of the outer casing is provided with an outer concave portion and an inner concave portion, the outer concave portion has a gap with the inner wall surface of the limiting sleeve, and can communicate with the external air flow, the outer concave portion a ring channel is formed between the end of the concave portion and the limiting sleeve, and the outer concave portion and the inner concave portion are communicated by the annular passage; at least one outer peripheral edge of the tapered portion of the fixing cylinder is provided with at least one staggered from the air leakage slot hole and penetrated and fixed a second air inlet port inside the cylinder is connected to the inner concave portion, and the air outlet slot is provided with a second air outlet opening to communicate with the inside of the fixed cylinder body; the peripheral edge of the linkage fan is provided with an air guiding duct, and the end surface of the connecting fan is open to communicate with the second inlet Tuyere, its peripheral opening system Corresponding to the second exhaust air outlet, the air leakage slot and the outlet are connected; by the above structure, the heat dissipation of the rear bearing is achieved, thereby avoiding the utility of the electric hand tool heating and ironing, causing the use failure and reducing the life. The heat-dissipating structure of the electric hand tool according to the first aspect of the invention, wherein the outer casing is formed as a two-and-a-half-half shell, and is provided with a screw-in phase screwing assembly, and the upper and lower ends of the constricted portion of the fixing cylinder are provided. There is a plane, and the screw seat is just above the plane to limit the fixed cylinder from being detached. The heat-dissipating structure of the electric hand tool according to claim 3, wherein the inner side of the outer casing is provided with a convex block, and the concave portion of the fixed cylinder is provided with a corresponding groove of the corresponding convex block to be engaged with each other, and the fixed cylinder is restrained. Can not be rotated, so that the outer casing and the fixed cylinder are firmly integrated.